Molding device for making concrete blocks



Sept. 13, 1921.

1,642,247 R. KRAUSE V MOLDING DEVICE FOR MAKING CONCRETE BLOCKS Filed 924 2 Sheets-Shut 1 Sept. 13,1927. 1,642,247

R. KRAUSE MOLDING DEVICE FOR MAKING CONCRETE BLOCKS Filed Nov. 5, 1924 2 Sheets-Sheet 2 Patented Sept. 13, 1927.

* UNITED STATES PAT NT OFFICE.

nunonr' KRAUSE, "or vrmma, Arrs'rma;

MOLDIN G DEVICE FOR MAKING CONCRETE BLOCKS.

Application filed November 5, 1924, Serial No. 747.984, and in Austria March 22. 1928.

This invention relates to the manufacture of concrete blocks to. be used in building, especially blocks of angular shape, and to a device for making same, which device consists of a pluralit of elements forming the molds for the bloc s. a

The invention aims at improving these elements so that blocks of ditl'erent thickness can be made therewith, that assembling the elements to a molding device allowing a number of blocks to be produced simultaneously, can be easily etl'ected and that a reliable connection (fastening) ol' the elements is assured, which surely prevents loosening of the elements or of parts thereol" during operation. A further object of the invention is an improvement forcing the operator to proceed in such manner, that, deterioration of the blocks by removing the elements is prevented. Finally the invention also oti'ers the advantage, that theelemeuts, although being simple, strong and durable, can be made at relatively low costs.

For obtaining these advantages accordin to the present invention thosewalls ol' eac 1 single mold or element, to which the end faces of the blocks to be made will apply, are made so as to allow interchangeable pieces or walls to be fastened thereon. According to the invention these end-walls are firmly (rigidlylsecured to the outer surface of the plates or walls on which the longer (side-) surfaces of the block are formed, (hereinafter called the sidewalls). 35 manner of securing the endplates to the side walls offers the advantage, that the elements can be manufactured at reduced costs and that withdrawal of the element from the blocks is facilitated. The connection or fastenin of the elements so as to form, when unite d, a rigid body is effected by means of the handles of each element,,.these handles having such form as to engage with slots ornotches of the adjacent element, and furthermorefby'means of clamping rods connecting the outer elements, that is to say,

the first and the last one.

Further features of the invention will be described with reference to'the drawing, in which Fig. 1 shows a perspective view of the entire molding device containing a number of assembled elements for producing angular blocks,

necting the end elements together, and

This

Fig. 2 a similar new of a device for con- I The combined device as shown in Fig. 1 is composed ot'anumber of elements 1, all of which are perfectly alike excepting the end elements 2 and 3. Each element consists of a plate 4 bent angularly and constituting the side wall, and corner irons or angularly bent plates 5, the one side or leg of which is rigidly secured to the plate 4 by" 'elding, by means of rivets or in any other-convenient manner. The other part of the bent plate 5, extending at an angle, mostly at right angle from the plate 4, thus forming the end wall, 18 provided ,with a handle 15 and with an aperture 6. The latter is com osed of a circular hole and of a slot com ined therewith so as to allow therivethead 7 of an interchangeable piece' 8 to engage therewith, it blocks are to be made, the thickness of which ought to exceed the breadth of the normal end plate. At the lateral ed es of the side lates 4 notches 9 are provider? in order to ta e up the handles 15 of the adjacent element. The

For assembling the elements, to begin with either of the end elements 2 or 3, they are notches 9 of the adjacent element. Then the end elements are connected by means of the rod 11 and all the elements clamped together by turning the said nut. Concrete is filled into the molds and beaten down (rammed).

In order to, prevent some of the concrete to fall outside of the molds plates 20 may be provided at the upper edge of the end plates.

I simply placed side by sideso that the han- I dles l5 ofeach element will engage with the Elli their lower one with notches 21 adapted. to engage with conveniently formed extensions 22 of. the division plates.

Fig. 2 shows an embodiment of the mold allowing to use uniform elements through out so as to dispense with special forms 01' elements to be used at the ends of the entire device. For this purpose the head 14 of the partly threaded clamping rod 11 is provided with a slot 16 engaging with the end plate of the lastelement and with another slot 17 engaging with its handle. The nut of the clamping rod presses against a bracket, block or plate 18 provided with a slot by means of which this block 18 is held on the edge of the side plate of the last element. The clamping rod passes freely through a hole of the bracket 18 and rests on the handles 15 of all the elements, thus keeping the'entire clampmg device in position.

Another way of connecting the end elements is shown in Fig. A flat rail 24 is near to its end provided with a number of holes 25 engaging with tenons or bolts 26 of the end elements. The inner edge of the rail is toothed so that the lateral edges of the side plates 4 will engage with one of the spaces between the angular teeth. The pitch toothing is chosen such that said edges will also engage with one of the tooth spaces, interchangeable i'eces are mounted on the endplates for ma ing blocks of varying thickness.

Fortaking apart the elements first of all I the clamping rods 11 are dismounted, then element 3 is pulled so as to slide on the baseboard and is removed. Now the first block B only reclines upon the inner surface of the side plate of the next element (see Fig. 1 The operator grasps the handles 15 of this element and pulls the latter together with the block in the direction of the arrow 11 so far that the handles disengage from the notches 9 of the third element. Thereafter the second element is lifted upward. Thereby the lateral edge of the third element will act as a guide for the handles 15, thus fa'cilitating the lifting of theelement and preventing any deterioration of the block.

- If the device is-to be dismounted immediately after the, concrete has been beaten down, the proceeding is somewhat to be modified, as in such case the block which is only supported and protected on its one side is liable of being damaged when sliding on the base board. In order to prevent this dr aback the sliding of the block B is carout in such manner that both sides of covered and protected during the slidplates, as is shown in Fig. 5. At

shown, from which the protecting elements had already been withdrawn. The next block is also shown after havin been pulled away from the body formed by the other hand side of this figure a block is re ease? blocks and elements. As is seen, this shiftthe next (1 on its back, that is to say the first one roteetin the inner face as well as f P is the end surfaces and the other the outer \face thereof. The first element (1 can now easily be removed by first pulling it in the direction of the arrow (1 until the handles l5k will disengage from the notches 9 of the eleinpnt (1) and then lifting it up. Thereafter -tl e element (1 is shifted back so as to toiic'liefihe inner face of the third block in order to s gte t ,.this"latter one and now the third block can be handled in the same manner as has just been described for the second one.

The elements progressively removed from the combined mold are united again to form another molding device, thus enabling of continuous operation with a respectively small number of elements.

In known elements for 'making angular blocks the end plates are fixed on the inner surface of the angular plate 4. If these end plates are rigidly secured to the side plates at their inner surface, damaging the block by lifting up the element cannot as a rule be avoided in practice. It is therefore necessary to secure the end plates to the side plates by means of knuckles and to turn the end plates outward before the element is lifted.

But it according to the present invention the end plates are disposed at the outer surface of the angular side plates, the knuckles can be dispensed with, as now the end plates do not touch anymore the end faces of the block, when the element is lifted. The ele ments are therefore by this arrangement rendered cheaper and disturbances which may result from the knuckles being jammed, are thus avoided. Furthermore the operation of taking the device to pieces is simplified. Also the particular manner of the handles being secured to the end plates is intended to avoid deterioration of the block, as the handles are disposed in the plan of said end plates.

I claim: y

1. A molding device for makin concrete blocks consisting of a plurality 0 elements with two flat end walls, both of which are rigidly secured to the same face of the side wall so as to extend in divergent directions, these flat end walls being adapted to removably fasten thereon interchangeable pieces, which. are broader than the end plates for the purpose of va ing the thickness of the blocks to be ma e.

2. A molding device for making blocks consisting of a plurality of elements with two flat end walls, both of which are rigidly secured to the same face of the side wall so as to extend in divergent directions, these till fiat end Walls being provided with slots adapted to engage with tenons of interchangeable pieces for varying the breadth of the single molds.

3. A molding device for makin concrete blocks consisting of a plurality of elements with two fiat end walls, both of which are rigidly secured to the same face of the side wall so as to extend in divergent directions, and which are provided with handles serving for lifting up the element, these handles engaging with notches provided at the lateral edges of the side plates of the adjacent element.

4. A molding device for making blocks consisting of a plurality 0 concrete elements with two flat end walls, both of which are rigidly secured to the same face of the side wall so as to extend in divergent directions, the space between the uDDer ed e of each end plate and of the protruding part of the side plate being covered by a plate preventing concrete from fallin outside the molds.

5. A molding device or makin concrete blocks consisting of a plurality 0 elements with two fiat end walls, both of which are rigidly secured to the same face of the side wall so as to extend in divergent directions, and of rails having a number of holes adapted to engage with tenons of the end elements.

6. A molding device for makin concrete blocks consisting of a plurality 0 elements with two flat end walls, both of which are rigidly secured to the same face of the side wall so as to extend in divergent dilections, and of toothed rails having a. number of holes, the lateral edges of the side lates of the elements engaging with the teet of said rails.

In testimony whereof I have affixed my signature.

RUDOLF KRAUSE. 

